Just a small followup on the "fresh fish" COB (95CRI) - The Planted Tank Forum
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post #1 of 11 (permalink) Old 09-12-2017, 02:34 AM Thread Starter
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Just a small followup on the "fresh fish" COB (95CRI)

There was really never a 6500K COB (or single emitter actually) that was "ideal" in a sense..
Usually either too yellow and not enough cyan.

That said there were some that were quite passable. Have some Luxeon Rebels off eek bay that certainly were acceptable and cheap:

Quote:
10pcs PHILIPS LUMILEDS LUXEON Rebel ES 3W Cool White 6000-6500k High Power LED
That was 30W for $11..
The fresh fish COB was $18.31 for about the same wattage but need to add shipping to it.
Note that there is no real "lens" on the "fresh fish" COB 135 degrees but 50% of the light is in 118 degrees..
This may or may not be like "normal" diodes which usually just say 120 degrees for the most part.

Quote:
Total angle at which 90% of total luminous flux is captured.
2. Viewing angle is the off axis angle from the LED centerline where the luminous intensity is of the peak value.
To b honest.. never really thought about it too much..
Anyways a comparison of 3 COBs
4000k Luminous Devices high CRI chip
5000K SORRA violet pump COB (runs really hot BTW)
6500K fresh fish COB. (Really how can you resist.. )

WB was set at 6500k so all lower k's will appear slightly warmer than what your brain will see.. We are more flexible to tones..



NOTE: Corrected image.. just wasn't "fair" to the 4000k one..old as link
http://www.qualiteitems.com/images/456500kbbbb.JPG

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Last edited by jeffkrol; 09-29-2017 at 12:14 AM. Reason: New image
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post #2 of 11 (permalink) Old 09-12-2017, 03:06 AM Thread Starter
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Should add a few things to the above..
Fresh fish spectrograph.
They don't list CRI for any of their specialty chips since most would be, to be honest, probably pretty pss poor due to them targeting specific wavelenths for product sales..
This is a guesstimate exception o this rule.. May ask them for it.. I'm sure it is recorded elsewhere.
Also photos shot in "natural" mode so no vibrance pumping.
Mild noise reduction..


for fun.. what one can easily do w/ digital photos..
Told my program that the wb should be 4000k and this is what that yellow photo now becomes.. Fun huh..

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post #3 of 11 (permalink) Old 09-12-2017, 09:55 PM
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Hmm. Those fish look "fresh" indeed. Which of the two "6500k" pics would you say looks most accurate to life?

Either one looks pretty good from what I can tell. What would your opinions/impression of it be? Seems to have a nice bit of cyan/blue from here.

Last edited by Lingwendil; 09-12-2017 at 09:57 PM. Reason: Edit
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post #4 of 11 (permalink) Old 09-13-2017, 12:00 AM Thread Starter
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They are well balanced.. Only high K (>5000K)I've ever found that could stand alone.. but not much fun in that..
You can see some of the good color in the dead Nerites aqua patches.. though a bit hard in this photo..

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post #5 of 11 (permalink) Old 09-13-2017, 12:35 AM
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Cant tell anything from the pictures. Intuition tells me the 5000K is best. It looks more colorful, but I realize thats not how it looks in RL.

You subjective opinion of which is best is more interesting to me.
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post #6 of 11 (permalink) Old 09-13-2017, 12:38 AM
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Is this the particular one you ordered?

https://www.digikey.com/product-deta.../1416-1950-ND/
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post #7 of 11 (permalink) Old 09-13-2017, 12:44 AM Thread Starter
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Quote:
Originally Posted by Lingwendil View Post
Is this the particular one you ordered?

https://www.digikey.com/product-deta.../1416-1950-ND/

Yes............

Quote:
Originally Posted by ChrisX View Post
Cant tell anything from the pictures. Intuition tells me the 5000K is best. It looks more colorful, but I realize thats not how it looks in RL.

You subjective opinion of which is best is more interesting to me.

Personally...........Edge is still w/ the Sorra and violet pump..
But 1) They currently are not manuf. 5000k chips and 2) Need to buy whole units and disassemble.. 3) Low wattage and would probably need god active cooling if "pushed".

Still prefer single rows of emitters over COB's.

6500k is still a good range for most people..IF a good balanced spectrum.
Don't know anyone who would think daylight sucks over a planted tank.. well some might.

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Last edited by Darkblade48; 09-13-2017 at 02:38 PM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #8 of 11 (permalink) Old 09-29-2017, 12:16 AM Thread Starter
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WOO Hooo...One of the few 6500K chips w/ higher than 90 CRI..
AFAICT.................


Quote:
Dear Jeff,

Thank you for your interest in Lumileds. We apologize for the delayed response.

The CRI measurement is 95 typical.

We hope this information was useful.

Regards,

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post #9 of 11 (permalink) Old 09-29-2017, 05:11 AM
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Quote:
Originally Posted by jeffkrol View Post
WOO Hooo...One of the few 6500K chips w/ higher than 90 CRI..
AFAICT.................
Wow! Not bad at all!


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post #10 of 11 (permalink) Old 10-04-2017, 07:32 AM
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Wow add a couple deep red LEDs to that to supplement and you get yourself a nice light!

So been looking at cobs again for a new project. Playing with Spectra you can get pretty good results taking a 3k led and mixing in Royal blue to move the temperature to the 6-7k range and keep the cri pretty nice. Would be a super simple way to give you warm temp mornings and cool temp noon/afternoon. Any thoughts on that?
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post #11 of 11 (permalink) Old 10-05-2017, 09:55 PM
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Try it with regular blue instead of royal


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